Translations Update

I finally updated various translations that have been submitted in the past few months. Sorry for the long delay. Anyway, the following languages were updated:

Dutch (nl), Finnish (fi), French (fr), German (de), and Italian (it);

and a few new languages were added:

Catalan (ca) and Slovenian (sl).

I ask each of the contributors to do a quick sanity check on the committed files to make sure that there were no errors during the process. Please see the Translations page in the external Zimbra Wiki for details. This page also has links to the results of the i18n-check tool.